Dhal and bitter gourd curry

Ingredients:

1 1/2 cup dhal/lentils - soaked for 1 hour and boiled till soft with 1 tbsp turmeric powder
5 bitter gourd/bitter melon - remove seeds and sliced into chunks
3 red & 2 green chillies - sliced into 3-4 pieces
6 shallots - remove skin
6 garlic - remove skin
1 1/2 tbsp cumin seeds
2 sprigs curry leaves
2 tbsp oil
1/2 lime - extract juice
1/2 liter of water
salt to taste

Preparation:

Into the pot of boiled dhal, add water, shallots, garlic, chillies, bitter gourd and salt to taste.
Stir and mix, let it cook until the gourd becomes soft.
Heat oil in a pan and when heated, very quickly fry the cumin and curry leaves.
Pour into the pot of curry after which add lime juice, give a good stir and remove from heat.

What kind of chilies do you use?